* {
    margin: 0;
    padding: 0;
    list-style: none;
}

body {
    background-color: papayawhip;
}
.score {
    font-size: 25px;
    font-style: 700;
    color: red;
}

.tage {
    position: relative;
    width: 800px;
    height: 600px;
    background-color: #ddd;
    margin: 10px auto;
    overflow: hidden;
}

.show1::after {
    content: "game over";
    position: absolute;
    top: 0;
    left: 0;
    width: 800px;
    height: 600px;
    font-size: 5rem;
    text-align: center;
    line-height: 600px;
    opacity: 0.5;
    background-color: #999;
}

.show2::after {
    content: "死因，自残";
    position: absolute;
    top: 0;
    left: 0;
    width: 800px;
    height: 600px;
    font-size: 5rem;
    text-align: center;
    line-height: 600px;
    opacity: 0.5;
    background-color: #999;
}

header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0 auto;
    text-align: center;
}

header h1 {
    font-size: 60px;
    line-height: 100px;
}